By looking at the diagram it's clear that:
Eng2:
Master Warning
Beta2 increase from 30 to 90
ITT, FF, NP, NL, NH all go down
Eng1:
Bleed Closes
Objective Torque increases from 90% to 100%
All that is consistent with ENG2 failure and UPTRIM kicking in.
ENG1 doesn't seem to indicate problems and, as per investigators info, ENG1 throttle was moved back which seems to agree with the diagram where gradual reduction of FF and ITT is seen (not nearly as drastic as what happened to ENG2).
Only when Fuel SO is operated in ENG1 you see similar behaviour to that experienced by ENG2 (more drastic ITT, NP, NL, NH and BETA2).
But just because ENG1 doesn't seem to have drastic problem, it doesn't mean it couldn't have some problem that lead the crew to identify it as the problematic one.